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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '429e5f8e7e07e5b51f3b6655bae5588aed86ac60f4cd84941c0eeedbc10fd0d8' 
  AND token = '3PlI4GJV4cHawFhHh+cTmiU3yW5Fqd0iRYFYF88sfao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}